package com.qfjy.homework.jiwentao;


public class ObserverPattern {

    public static void main(String[] args) {

        Subject subject = new ConcreteSubject();
        Observer obs1 = new ConcreteObserver1();
        Observer obs2 = new ConcreteObserver2();

        subject.add(obs1);
        subject.add(obs2);

        subject.notifyObserver();
    }
}
